About 20 years ago, I knew someone in the industry who said that the smallest jet engine that you could buy was close to (roughly) three quarters of a million dollars and the examples he gave me were engines that you might be able to pick up but they weighed 260 pounds. I haven't verified this.
http://en.wikipedia.org/wiki/Bede_BD-5http://www.rcuniverse.com/magazine/arti ... cle_id=166http://www.rmcybernetics.com/projects/D ... engine.htmThe man in the video has different technology than the ones that existed 20 years ago.